Locking stem extension



FIG. 1 is a perspective view showing details of a first end of our new design;

FIG. 2 is a perspective view showing details of a second end of our new design;

FIG. 3 is a front view of our new design, the rear view being a mirror image thereof;

FIG. 4 is a first end view of our new design showing the first end as designated in FIG. 1;

FIG. 5 is a second end view of our new design showing the second end as designated in FIG. 1;

FIG. 6 is a top view of our new design, the bottom view being a mirror image thereof;

FIG. 7 is a perspective view from the second end identified in FIG. 1 showing details of an interior of our new design;

FIG. 8 is a side view of our new design rotated along an axis thereof to a position askew of the front view of FIG. 3 and the top view of FIG. 6;

FIG. 9 is a perspective view of the first end of our new design identified in FIG. 1 showing details of an interior of a first segment of the first end thereof;

FIG. 10 is a perspective view of the first end of our new design identified in FIG. 1 showing details of an interior of a second segment of the first end thereof;

FIG. 11 is a perspective view of the first end of our new design identified in FIG. 1 showing details of an interior of a third segment of the first end thereof; and,

FIG. 12 is a perspective view of the first end of our new design identified in FIG. 1 showing details of an interior of a fourth segment of the first end thereof. 

We claim the ornamental design for a locking stem extension, as shown and described. 